Right now I do not feed my two remaining cats canned food. I do give my male some human tuna but not to Kitty. She only gets Pedigree Gentle dry food and a few treat pellets twice a day.
Plus she's living in the Library atop the tallest bookcases. Thankfully she is still using the litter box in the Laundry room and drinking water in the kitchen.
I still have extra canned cat food and if I had a car I would drop off at SPCA. I keep forgetting to give them to Boy to do so for me.
I've done the same with Dry food - both dog & cat - that the critters refused. But that has been a rare event.
The only time I discarded dog food was when there was a BAD production of dog food in Texas. It had mold in it and almost killed Miz Zeke & Alex. The both ended up at the vet for over a week.
I burned the contents of the bag but gave a sample and the bag to the vet for testing.
Thankfully none of the rest of the BAZARS became ill like Miz Zeke and Alex did.
Charlie did not do well on the Grain free as he lost weight being on it. It took me a while to find Pedigree Healthy Weight - which keeps him in really good shape. Before he gained weight on other dog foods even with all out time outside activities.
Love All Life, Thank You For Posting! :)